process set query: if pmix_query_info_nb returns error

don't wait for call back to be run as it will not be
per section 5.4.4 of PMIx 4.1 standard.

related to #10749

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

Author: hppritcha

ompi/instance/instance.c

@@ -1047,6 +1047,7 @@ static void ompi_instance_refresh_pmix_psets (const char *key)
                                                  ompi_instance_get_num_psets_complete,
                                                  (void*)&lock))) {
        opal_mutex_unlock (&instance_lock);
+       return;
     }
 
     OPAL_PMIX_WAIT_THREAD(&lock);